一种流体可能无法统治所有的流体
One fluid might not rule them all
摘要：
在这一过程中，我们介绍了我们最近的研究在高多重数质子-质子碰撞在$\sqrt{s}=$ 13 TeV的流体动力学集体使用VISHNU混合模型与不同的初始条件模型，称为HIJING，超级MC和TRENTo。我们发现，仔细调整参数，流体动力学模拟可以给出合理的描述所测量的两粒子的相关性。然而，在这三种初始条件下，多粒子的单谐累积量和混合谐累积量不能用流体力学来描述，甚至在少数情况下对符号也是如此。进一步的研究表明，非线性响应在p-p系统的流体动力学膨胀中起着重要的作用。这样的效果可以将$c_2\{4\}$从初始状态中的负值改变为最终状态中的正值。多粒子累积量的流体力学描述的失败引发了一个问题：流体力学是否可以统治所有的碰撞系统，包括在LHC的p-p碰撞。
英文摘要：
In this proceeding, we present our recent investigations on hydrodynamic collectivity in high-multiplicity proton--proton collisions at $\sqrt{s}=$ 13 TeV using the VISHNU hybrid model with different initial condition models, called HIJING, super-MC and TRENTo. We find that with carefully tuned parameters, hydrodynamic simulations can give reasonable descriptions of the measured two-particle correlations. However, multi-particle single and mixed harmonics cumulants can not be described by hydrodynamics with these three initial conditions, even for the signs in a few cases. Further studies show that the non-linear response plays an important role in the hydrodynamic expansion of the p--p systems. Such an effect can change $c_2\{4\}$ from a negative value in the initial state to a positive value in the final state. The failure of the hydrodynamic description of multi-particle cumulant triggers the questions on whether the hydrodynamics can rule all collision systems, including p--p collisions at the LHC.
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